And michael zieb



3 Sheets-Sheet 1. 0. BR-EMAKER' & M. ZIER, sr.

(No Model.)

PAPER PULP YDIGBSTER.

5 f m M Z 4 l. I w W 4 D ML. %m M 6 n e x t A m M w w 3 E N N. PETERS, PhoRvLilhogn-nphor. Wuhingtum D. C,

3 Sheets-Sheet 2.

(No Model.)

0. BREMAKER 85M. ZIER, Sr.

PAPER PULP DIGESI'ER.

No. 333,105. Patented D60. 29, 1885.

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PAPER PULP DIGESTER.-

n. wzrzns. PhohvLilhugnphcr. Washington D. c.

O. BR'EMAKER & MEIER, Sr.

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3'Sheets -Sheet 3..-

' UNITED STATES PATENT OFFICE.

CHARLES BREMAKER, or LOUISVILLE, KENTUCKY, AND MICHAEL ZIER, sa,

OF NEWV ALBANY, INDIANA.

PAPER-PULP DIGESTER.

SPECIFICATION forming part of Letters Patent No. 333,105, dated December 29, 1885.

Application filed March 30, 1885. Serial No. 160,710. (No model.)

.To all whom it may concern:

Be it known that we, OHARLEs BREMAKER, of Louisville, in the county of Jefferson and State of Kentucky, and MICHAEL ZIER, Sr., of New Albany, in the county of Floyd and State of Indiana, citizens of the United States, t

seven feet in diameter, and about twenty-six feet (more or less) in height, madein sections or rings sufficient in number to make the height, and bolted together by means of strong double flanges, with lead rings or gaskets between the flanges, in order to render the joints steam-tight, with the whole inside surface covered with sheet-lead, while the bottom and top heads are made convex in form, and secured to the end rings by means of bolts through the flanges, and are also covered'with lead on the inside, with an opening in the center of the top for charging it with stock, and also one in the bottom for removing the refuse liquor therefrom, and through which steam is introduced into the boiler. The lower part of the digester is provided witha false bottom in the inside, made the full diameter of the digester, covered with sheet-lead, and made to rest upon stands or supporting-bolts screwed into the bottom head of the digester, with a pipe in the center extending up within about two feet (more or less) of the top,the upper end of which is perforated with small holes near the top, and also another pipe in the bottom cap, through which the steam is introduced into the digester in its operation.

The object of this our invention is to provide asuitable digester or boiler for preparing paper-pulp,made in sections or rings,with

g. strong double or single flanges on the end of each section, by means of which they are securely bolted together, with a lead ring or gasket between the parts, in order to render the joints steam-tight, and sufficiently strong to resist a high pressure of steam in so large a vessel, the entire inside of which is covered with sheet-lead, to prevent the liquor used on the stock from injuring the iron or steel of 5 which the digester is constructed.

We attain the above object by the mechanism illustrated in the drawings, in which Figure 1 is a sectional View of the digester, showing between them, and the false bottom in the interior, with the supporting stands or bolts under it, and the general construction of the detachable chamber-rings on the top and hot- .the double flanges of the rings with gaskets 6c tom heads, when made of composition metal requiring no lead lining. Fig. 2 is a flat or top view of the false bottom, showing the small holes, and also the supporting-bolt, washers and nuts, and flanges of the digesterrings and lead lining thereof. Fig. 3is asec- 7o tional view of the flanges, on a larger scale, showing the lead ring or gasket between them extending outside of the bolts. Fig. 4 is a sectional view of the washers on the upper end of the supporting stands or bolts above and below the bottom, with nuts on the top and pins in the plate between the washers. Fig. 5 is a flat View of the supporting-bolt washers, showing the pins of the plate upon which the washers rest.

with gaskets, and false bottom in the interior, with the stands upon which it rests, and the general arrangement of the bolts by which Fig. 6 is a sectional view of the digester, showing thering-flanges the digester is bolted together, and also the suitable number of which may be used to 5 make the required length. B B are the double flanges, which are riveted to the end of the digester-rings,which are.

made of rolled plate iron or steel, about six inches (more or less) on the face,with rounded ro corners, as shown in the drawings, with one shrunk over the other, in order to increase the strength, it being almost impossible to make them sufficiently strong from asingle sheet of metal without much trouble and expense.

O G is the lead lining of the digester-rings, which extends out through the flanges, to prevent the liquor from injuring the iron face of the flanges.

D is a lead ring or gasket between the flanges, to render the joint steam-tight when screwed'down upon it. The faces of this lead ring D, which are made flat, extend outside of the bolts G, and are each provided with small raised rings F around the bolts,with two raised rings (more or less) between the bolts and inner edge,on a line with the ring, to prevent the liquor from leaking through to the bolts G,which are inserted in the flanges B B, somewhat as shown in Fig. 6 of the drawings, with aboutevery fifth bolt H (more or less) made to extend up through the flanges of the lower head, and through both flanges of the lower ring, and also up through the lower flange of the next ring or section, with screwnuts above and below each pair of flanges as they come together, so that each end of the 'long bolts H assists the intermediate short bolts, G, in drawing the flanges together steamtight, besides another advantage hereinafter named. After the first series of long bolts are put in around the digester the lower ends of the second series of long bolts pass through the same flanges of the digester, the upper ends of thelong bolts in the first series and lower ends of second series of long bolts are placed between the upper ends of the bolts in the first series, with short bolts placed in each pair of flanges between the long ones in each ring or section added, and so on in like manner un til the full series of long bolts are put in and made to pass through both the top and bot tom head-flanges of the digester, as shown, the object of which, and the great advantage we claim by this method of bolting, is that it secures the digester from end to end, and adds greatly to its strength and security, that cannot be otherwise obtained.

I is an opening in the side above the false bottom, about eight inches (more or less) in diameter, and J is a raised ring riveted to the digester around the opening, to answer as a flange, to which a blow-off valve is bolted, but not shown, for the purpose of discharging the contents of the digester.

K is the bottom head of the digester, the inner parts of which are made in two pieces, about five-eighths or three-fourths of an inch in thickness, and convex in form, with the edges butted together about midway from the center of the digester, in order to make a smooth surface on the inside for the lead lining, while the verge parts, constituting the flanges by which it is bolted to the digester,

is provided with an additional thickness of the same material, riveted at the edge of theflanges,

and extending in so as to overlap the butted joint of the head, to which it is firmly riveted on each side of the joint, as shown, and thereby answers as a means of connecting the parts constituting heads, and for giving strength and rigidity to the projecting flange, by which it is bolted to the digester, as shown.

The central part of the bottom K is made of a single sheet of iron or steel about three fourths of an inch in thickness and riveted to the edges of the outer circular parts of the bottom head, with an opening, M, in the center about sixteen inches (more or less) in diameter, and of any suitable form, with an angle-flange turned on the sheet within the opening, to which a flanged ring, N, is riveted, to form a flange to which the chamber Ois bolted, which chamber is made of any suitable metal, and in form as shown in the drawings, and covered with a removable cap, P, of suitwhich the steam-pipe Q enters the digester,

. as a means of supplying the steam to operate it, and when the cap is removed it is intended for the purpose of discharging any remaining liquor in the bottom, the whole inner surface of which is lined with lead, R, except the chamber 0 and removable cap P, which are made of bronze or other suitable metal.

S S are the stands or bolts which support the false bottom of the digester, which are screwed into the bottom of the digester, with suitable washers, T, under the collars to level up the angle of the head-bottom. These washers are recessed on the under side, in which a gum washer, U, is placed, to prevent the liquor from leaking through to the iron head below. All of these bolts and washers are made of bronze, or other suitable metal that will stand the acid without lead coverlng.

V is the false bottom,which is made of iron or steel about five-eighths of an inch in thickness, fillingthe entire diameter of the digester loosely,with the whole surface perforated with small holes W W, as shown in part in Fig. 2

of the drawings, and covered with sheet-lead, X,about one-fourth of an inch (more or less) in thickness on both sides and edges,and in order to lead-line the iron plate V within the holes, which extend through the lead lining also, a small piece of lead pipe,y,is inserted in each hole and made to adhere to the lead surfacelining by means of soldering or burning on both sides of the bottom, which process may be employed exclusively in lead covering the P are inserted under the washers, extending through the plate V from each side, and there- .by rest upon each other, as shown in the V, while the other end extends up within about two feet (more or less) of the top of the digester,with both inside and outside covered with lead B. This pipe A is intended for the purpose of regulating the pressure at each end of the digester, and also for circulating the liquor in' the inclosed vessel under pressure, and is not attached to any pipe outside the digester.

O is the upper head of the digester, which is made of ,the same material, and in all other respects similar to the bottom, with an opening, D, in the center, about twenty inches (more or less) in diameter, or of any suitable form for charging the digester with stock, with a flange, E, turned on the inner headsheet, to which a flanged ring, F, is riveted, and to which the flanged chamber G is bolted, and rendered steam-tight by means of lead rings or gaskets D, similar to the ones used between the rings of the boiler-flanges. This flanged chamber G is made of any suitable metal that will resist the action of the acid without lead lining, and is made in form as shown in the drawings, and covered with a removable cap, H, made of the same or other suitable material, and in form as shown.

J is a branch pipe in the cap H for blowing on" the steam to reduce the pressure preparatory to discharging the contents of the digester.

K is a branch on the side of chamber G, which may be used instead of the one in the cap.

L is also a branch on the side of chamber G, which is made in form as shown, with additional branches, N and O, to which a safetyvalve and vacuum-valve are attached, but not shown.

P is a branch pipe in the digester-head, to which a stop-valve, P and vacuum-valve W are attached, as shown.

Q are small bolts screwed'into a washerformed nut, V, on the inside of the digesterrings, to prevent the lead lining from collapsing when the steam is blown off, any number of which may be used.

The opening D in the top of the digester is provided with a plate or cover, D", perforated with small holes, and made to rest upon lugs on the sides of the chamber, to prevent the stock from rising up and obstructing the branch openings. R is the opening and S is the chamber-ring on the bottom, and T is the opening and U is the chamberring on the top, as shown in Fig. 6, showing their general construction when made of iron or steel, requiring lead lining.

G G are a series of small bolts inserted in the ring flanges B at intervals, as before stated.

' By adopting the use of the several branches, as shown, on the sides of the chambers G and, U the necessity of breaking the pipe-connections every time the digester is to be charged with stock is avoided, and thereby much time and labor are saved. Therefore, We do not claim anything as our invention in paper-pulp digesters made of iron, having forged-iron rings riveted to the shell of the boiler and boltedtogether with bolts, or a perforated false bottom made of iron, uncovered with lead, such as are used in what is known as the alkali process, which does not re- .quire a lead-lined digester; but

sire to secure by Letters Patent, is.

1. In a paper -pulp digester, the bottom head, K, and top head, 0, consisting of two parts each, convex in form, with the edges securely riveted to an additional thickness of the same material extending in from the flanges, to whichitis riveted,suflicient to overlap the butted seam, and thereby answer as a means of connecting the heads and giving strength and rigidity to the projecting flanges, substantially as herein described, and for the purpose set forth.

2. In a paper-pulp digester, the flanges B, B, made of rolled plate metal in two parts, one placed over the other, substantially as described, and for the purpose set forth.

3. In a pulp-digester, the combination of the chamber G, in the form shown, with its cap H and branch J on the top, and branches K and L on the sides, and branch N, to which a safety-valve may be attached, substantially as described, and for the purpose set forth.

4. In a paper-pulp digester, the branch pipe P, vacuum-valve W, and steam-valve P connected with the top of the digester, substantially as described, and for the purpose set forth.

5. In a pulp-digester having a perforated false bottom,V, the surfacelead liningXXand small lead pipes Y Y, by means of which the holes are lined, substantially as described, and for the purpose set forth.

6. In a pulp digester, the small composition pins 1? P screwed into the false bottom V, against which the composition washers Z and T rest, substantially as described, and for the purpose set forth.

anchor-plates or washer-formed nuts V, and

bolts Q, for holding the lead lining O G to the inner surface of the digester, substantially as described, and for the purpose set-forth.

10. In a paperpulp digester, the manner of arranging the long and short bolts in bolting the rings together, commencing with the bottom flanges, by inserting a long bolt, H, in about every filth hole, which bolt is long enough to pass through the bottom flange and up through the flanges of the first and second rings, thereby constituting the first one of a series of similar long bolts, H, inserted side by side to the right and left in each set of flanges, extending up in like manner through the upper head, with screw-nuts on each end above and below each set of flanges, with the spaces between the long bolts H at the bottom filled with three short bolts G, but the other flanges above have only two short bolts G between each until the top head-flanges are reached, which will require three,thereby-se: curing the digester from end to end, substantially as described, and for the purposeset forth.

11. In a pulp-digester, the combination of the flanged chamber 0, cap-plate P, and pipeconnection Q, substantially as described, and for the purpose set forth.

12. In a pnlp-digester, the lead gasket or ring D, having small convex raised rings F around the bolt-holes and two raised rings-E E, on the faces inside of the bolts, on aline with the ring, substantially as described, and for the purpose set forth.

CHARLES BREMAKER. MICHAEL ZIER, SR. \Vitnesses:

FRANK'PARDON, GEORGE HAMMER. 

